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Akwanga
Basic information Name: Akwanga
     This is an OFFICIAL meteorite name.
Abbreviation: There is no official abbreviation for this meteorite.
Observed fall: Yes
Year fell: 1959
Country: Nigeria
Mass:help 3 kg
Classification
  history:
Meteoritical Bulletin:  MB 30  (1964)  Unknown
NHM Catalogue:  5th Edition  (2000)  H
MetBase:  v. 7.1  (2006)  H
Recommended:  H5    [explanation]

This is 1 of 10945 approved meteorites (plus 20 unapproved names) classified as H5.   [show all]
Search for other: H chondrites, H chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7)
Comments: Revised 23 May 2021: Classified by L. Garvie
Writeuphelp
Writeup from MB 30:
Warning: the following text was scanned and may contain character recognition errors. Refer to the original to be sure of accuracy.

AKWANGA, Nigeria; φ = 8°55'N, λ = 8°26'E.

FELL July 2, 1959, 3 kg.


Writeup from MB 110:

Akwanga, updated information and classification.

History: "The Akwanga meteorite fell on July 2, 1959, 2 miles from the village of Gaji, Akwanga Division of the Plateau Province, Nigeria. It weighs approximately 3 kg and made a hole about 18 inches deep at the point of impact. The noise of descent and impact was heard up to a distance of 3 miles.” [Geophysical Abstracts 189, April-June 1962, and taken from Macleod, W.N. and Jefford, G. (1961) The Akwanga meteorite. Records of the Geological Survey of Nigeria. for 1959, p 15-20.]

Physical characteristics: Fusion crusted stone with a few broad regmaglypts. Description based on a 5 × 7 cm slice. Sawn surface shows rounded light-colored clasts to 3 cm in a dark matrix. Even distribution of <1-mm-sized metal grains. Few thin shock veins. One chondrule to 3 mm, though most <0.8 mm diameter. Fusion crust to 0.5 mm thick.

Petrography: (L. Garvie, ASU) Thin section dominated by chondrules, most with moderately diffuse chondrule-matrix boundary, and metal grains with holly-leaf-shaped outlines in a fine-grained recrystallized matrix. Recognizable chondrules dominated by PO and BO types. Metal dominated by single-crystal kamacite some bearing diffuse Neumann bands. Less common rounded <0.4 mm metal grains with Ni-rich rims of tetrataenite and cores of kamacite. Native Cu common (15 grains recognized in one thin section) as small, <50 μm, grains associated with a composite grain composed of troilite, Ni-rich metal, and dark-etch plessite. Troilite grains typically <0.5 mm and single crystal lacking shock lamellae. Two petrographic types of chromite: anhedral grains to 0.2 mm, and regions to 0.4 mm composed of fine-grained (to 30 μm) chromite in feldspathic matrix. Feldspar abundant and typically in regions <25 μm across. A few scattered Ca-Cl and Ca-Na-Mg phosphates to 0.5 mm found.

Geochemistry: (L. Garvie, ASU) Olivine Fa18.8±0.4, Fe/Mn=36.1±1.9 wt%, n=15. Low-Ca pyroxene Fs16.4±0.2Wo1.3±0.1, Fe/Mn=22.6±1.3 wt%, n=13. High-Ca pyroxene Fs5.9±0.3Wo46.3±0.2, n=2, and Fs8.5Wo39.8, n=1.

Classification: H5, S2, W0

Specimens: 42.5 g slice and one thin section at ASU.

Institutions
   and collections
ASU: Center for Meteorite Studies, Arizona State University, Tempe, Arizona 85287-1404, United States; Website (institutional address; updated 14 Jan 2012)
Catalogs:
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References: Published in Meteoritical Bulletin, no. 30, Moscow (1964)
Published in Gattacceca J., McCubbin F.M., Grossman J., Bouvier A., Chabot N.L., D'Orazio M., Goodrich C., Greshake A., Gross J., Komatsu M., Miao B., and Schrader D. (2022) The Meteoritical Bulletin, No. 110. Meteorit. Planet. Sci. 1-4
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Photos:
CreditPhotos
Photos from the Encyclopedia of Meteorites:
Don Edwards   
Photos uploaded by members of the Encyclopedia of Meteorites.
    (Caution, these are of unknown reliability)
Jay Piatek   
Woreczko Jan & Wadi   
Geography:

Nigeria
Coordinates:
     Catalogue of Meteorites:   (8° 55'N, 8° 26'E)
     Recommended::   (8° 55'N, 8° 26'E)

Statistics:
     This is 1 of 2 approved meteorites from Plateau, Nigeria
     This is 1 of 21 approved meteorites from Nigeria
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